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Explaining, Fast and Slow: Abstraction and Refinement of Provable Explanations
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Proposes an abstraction-refinement method that merges neurons in a neural network to build a smaller abstract network, computing provably sufficient and minimal explanations faster than verification on the original network.
Problem
Computing provably sufficient and minimal feature-subset explanations for neural networks requires many expensive verification queries, which does not scale to large networks.
Approach
Abstract the network by merging similar neurons into a reduced network whose sufficient explanations are provably sufficient for the original; when a counterexample is spurious, iteratively refine the abstraction (increasing reduction rate) until the explanation converges to a provably minimal one for the original network.
Key results
- Abstract+refine reduces computation time versus the standard greedy verification method by 41% (MNIST), 36% (CIFAR-10), and 56% (GTSRB).
- On MNIST, mean explanation size is 204.4 for the proposed method versus 408.7 for the standard method under a 100s timeout.
- Heuristic methods Anchors and SIS yield sufficient explanations for only 0-25% of inputs, while the proposed method achieves 100% provable sufficiency.
Measured effects reported in the paper
| What was changed | Where | Measured | Effect |
|---|---|---|---|
| apply abstraction-refinement instead of standard verification | Provable sufficient explanations · MNIST | explanation size: 408.7 ± 36.6 -> 204.4 ± 129.2 | Helped |
| apply abstraction-refinement instead of standard verification | Provable sufficient explanations · CIFAR-10 | explanation size: 448.7 ± 138.4 -> 308.2 ± 236.6 | Helped |
| apply abstraction-refinement instead of standard verification | Provable sufficient explanations · GTSRB | explanation size: 502.4 ± 101.7 -> 230.6 ± 234.3 | Helped |
| apply abstraction-refinement instead of original-network verification | Provable sufficient explanations · MNIST | time: 207.80s -> 121.95s | Helped |
| apply abstraction-refinement instead of original-network verification | Provable sufficient explanations · CIFAR-10 | time: 1,838.2s -> 1,180.5s | Helped |
| apply abstraction-refinement instead of original-network verification | Provable sufficient explanations · GTSRB | time: 23,504s -> 10,235s | Helped |
| use Anchors instead of a verified method | Sufficient explanations · MNIST | sufficiency: 100% -> 25% | Hurt |
| use Anchors instead of a verified method | Sufficient explanations · CIFAR-10 | sufficiency: 100% -> 3% | Hurt |
| use Anchors instead of a verified method | Sufficient explanations · GTSRB | sufficiency: 100% -> 17% | Hurt |
| use SIS instead of a verified method | Sufficient explanations · MNIST | sufficiency: 100% -> 22% | Hurt |
| use SIS instead of a verified method | Sufficient explanations · CIFAR-10 | sufficiency: 100% -> 0% | Hurt |
| use SIS instead of a verified method | Sufficient explanations · GTSRB | sufficiency: 100% -> 6% | Hurt |
Surprising findings
- Heuristic explanations from Anchors and SIS are frequently not sufficient (0-25%), even though they are faster.
Limitations
- Depends on neural network verification queries, which remain limited in scalability for state-of-the-art models.
- Intermediate abstract explanations may not be minimal for the original network until refinement converges.
- Evaluated only on image classification benchmarks with small networks.
Experimental setup
Datasets: MNIST CIFAR-10 GTSRB
Benchmarks: MNIST CIFAR-10 GTSRB
Metrics: explanation size computation time sufficiency rate
Baselines: Standard verification-based minimal explanation search Anchors SIS
Builds on: neuron-merging abstraction for neural network verification minimal sufficient explanation search via verification (Wu et al. style) abductive/formal explanation
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